Lawinenlagebericht

Presidential Range

Mount Washington Avalanche Center
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Lawinengefahr

Mon
Hochgebirge
1 · Gering
Waldgrenze
1 · Gering
Unterhalb
1 · Gering
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Veraltet — dieser Lagebericht ist 4 years ago abgelaufen. Du siehst vergangene Verhältnisse, nicht den aktuellen Bericht.

Kernpunkte

Steep slopes with smooth, wind-drifted snow are the most likely areas to encounter an avalanche today. Use caution around these areas at upper and middle elevations, especially in steep, high-consequence terrain.

Lawinenprobleme

  • Wind Slabs

    • Hochgebirge
    • Waldgrenze
    • Unterhalb der Waldgrenze
    Wahrscheinlichkeit
    Possible
    Größe
    1

    Thin wind slabs of varying depth exist in isolated locations at middle and upper elevations on east-facing and south-facing aspects. In these small “pockets,” wind slabs may be poorly bonded to the slick melt/freeze crust and old snow below that could act as the bed surface for a small, human-triggered avalanche. 

    Identifying the few areas that would be “possible to ski” are going to be the same areas where it is likely to encounter this problem. Look for smooth, chalky-textured surfaces to help identify this problem. Assess the new/old snow interface with your hand or a shovel before committing to exposed terrain.

Avalanche Discussion

With such little snow and highly disconnected avalanche paths across the Presidential Range, skiers and climbers are being drawn to only a few specific terrain features in steep terrain that have enough snow to ski down or climb on. These areas are mainly in isolated areas in Tuckerman Ravine. Even with the unusually shallow snowpack, backcountry travelers are coming in contact with the few areas that have the ability to produce an avalanche.

Yesterday, two skiers triggered two separate wind slab avalanches while ascending steep snow slopes in Tuckerman Ravine. One of them was caught and carried and unburied. Both were uninjured. Both avalanches occurred in soft, wind-drifted snow that was poorly bonded to the slick melt/freeze crust below. Looking forward to today, these isolated snow fields could hold wind slabs that are slightly stiffer due to increasing winds yesterday afternoon but still just as poorly bonded to the old snow surface. 

Though both of yesterday’s events were small (D1) avalanches, they still had enough power to cause loss of balance or initiate a fall, which could have devastating consequences given the amount of exposed rock, ice, and vegetation that is exposed in this terrain. Even though the hazard rating is LOW, think carefully about your risk tolerance today and make your own slope-specific assessments to gauge stability and presence of wind slabs.

The Lion Head Summer Trail is OPEN due to reduced avalanche risk, and is currently the least hazardous, direct route to the summit of Mt Washington from Pinkham Notch. 

OBSERVATIONS: Please consider submitting an observation of what you are seeing in your travels. Submitting an observation hones your skills, informs other users, and improves our forecasts.

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